Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dam.iuav.it/iuav/containers/Az5r2Kv/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-44402a0f-f1c1-45d9-8ad1-0ada797ea6d4",
      "cw-72215a1e-6f60-46ea-a9b7-dd9bb30cdae4"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-46b59b2d-c0c8-4e01-b9eb-a5a1a4be7d04",
    "manifestId": "https://dam.iuav.it/iuav/containers/Az5r2Kv/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-72215a1e-6f60-46ea-a9b7-dd9bb30cdae4"
  }
}